Reading/opening files with Windows API (C++ Builder)

 private: // User declarations

         DWORD temp_Size;

         HANDLE temp_Handle;

         bool __fastcall handle_True(HANDLE value);

TForm1 *Form1;

SECURITY_ATTRIBUTES sec_Atr={sizeof(SECURITY_ATTRIBUTES),NULL,TRUE};

//---------------------------------------------------------------------------

__fastcall TForm1::TForm1(TComponent* Owner)

        : TForm(Owner)

{

}

//---------------------------------------------------------------------------

bool __fastcall TForm1::handle_True(HANDLE value)

{

 if(value!=INVALID_HANDLE_VALUE)

  return true;

 else

  return false;

}

void __fastcall TForm1::FormCreate(TObject *Sender)

{

 DirectoryListBox1->FileList=FileListBox1;

 DriveComboBox1->DirList=DirectoryListBox1;

 FileListBox1->FileEdit=Edit1;

 Label1->Caption=DateToStr(Date())+"   "+TimeToStr(Time());

}

//---------------------------------------------------------------------------

void __fastcall TForm1::FileListBox1Change(TObject *Sender)

{

 int a;

  char buff[64*64];

 memset(buff,0,sizeof(buff)-1);

 AnsiString temp_Text=FileListBox1->FileName;

 temp_Handle=CreateFile(temp_Text.c_str(),GENERIC_READ,FILE_SHARE_READ,&sec_Atr,

 OPEN_EXISTING,0,NULL);

 if(handle_True(temp_Handle))

  ReadFile(temp_Handle,&buff,sizeof(buff),&temp_Size,NULL);

 Memo1->Text=buff;

 CloseHandle(temp_Handle);

}